Life exists in some crazy places on Earth, I don't think it should be surprising that there might only be certain areas of a planetary body that are inhabited on any given planet or moon by Humans. Its weird to think about, but life on Earth for us is constrained in a massive way compared to the entire surface. Living at the boundary zone would definitely share similarities to living at a high latitude, like in Alaska/Eskimos. Its only weird to someones perception if its not your daily life. If we came across a planet that was a spitting image of Earth, except its only continent was the size of the USA. If that continent was where Antarctica is on Earth that's useless to us for the purpose of a colony as Antarctica is today. Thus, anyone who lived on a planet with 2 stars, or one that did not rotate, or on this boundary zone. That would just be their normal, it wouldn't fuck them up in any appreciable way, and don't think that severely restricts what kind of life might exist necessarily or why that would be a bad thing.
If fucking paradise is found in a 5 mile deep crater on some world why wouldn't we want to necessarily colonize that?
From
https://arxiv.org/ftp/arxiv/papers/1405/1405.1025.pdf
"...Life, if it manages to struggle along on such a planet, will be very hard or perhaps be underground. More likely a circular belt between the two sides - a sort of “twilight zone” - could be the place for life to evolve and flourish. In this dusk band around the planet, where star will be permanently hanging very low near the horizon or perhaps the stellar disc partially peeking above the horizon, with an ever-colourful red, yellow sky due to scattered light, the temperatures would be more moderate, right in between the hot and cold sides. However the heat on one side would cause the air to rise, creating a low pressure system, while the cold on the other side would cause the air to sink, creating a high pressure system. This would cause the planet to experience a constant and violent circulation of air, or, essentially a planet-wide hurricane. The constant air circulation would actually circulate the temperatures extensively and extremes in temperature would mitigate. Water cycles with huge rivers crossing from cold to hot side might make living there possible.
One important issue is the concept of time. With no day-night cycles, concept of time will be difficult to come. On Earth right from birth, we notice that many phenomena in nature are repetitive. This is due to our most basic natural clock, viz. the rotation of the Earth, causing the rising and setting of the Sun, giving rise to alternative periods of light and darkness. All human and animal life has evolved accordingly, keeping awake during the day-light but sleeping through the dark night. Even plants follow a daily rhythm. Of course some crafty beings have turned nocturnal to take advantage of the darkness, e.g., the beasts of prey, blood–sucking mosquitoes, thieves and burglars, and of course astronomers.
At least there might be no astronomers on a tidally-locked planet, as starry sky may not be known (except for some rumours about it by adventurer fellows daring to venture deeper into darker side of the planet). Secrets of the Universe − planets, stars, Milky-way, other galaxies −all these might remain very difficult, if not outright impossible, to unravel. Just imagine, it took us humans thousands of year to figure out that a few "wandering stars" are heavenly bodies (planets) in just our neighbourhood and all this happened in spite of the fact that a starry sky is daily visible most places for about half of the time (night). How will the inhabitants of a tidally-locked planet ever know about it when their everlasting "hot summer afternoons" never turn into cool evenings and dark nights?..."
I think I'll pass!
